#include <REGX52.H>
#include <intrins.h>

void Delay500ms()		//@11.0592MHz
{
	unsigned char i, j, k;

	_nop_();
	i = 4;
	j = 129;
	k = 119;
	do
	{
		do
		{
			while (--k);
		} while (--j);
	} while (--i);
}


void main()
{
	while(1)
	{
		P2 = 0xFE;		//1111 1110 
		Delay500ms();
		
		P2 = 0xFD;		//1111 1101 
		Delay500ms();
		
		P2 = 0xFB;		//1111 1011 
		Delay500ms();
		
		P2 = 0xF7;		//1111 0111 
		Delay500ms();
		
		P2 = 0xEF;		//1110 1111 
		Delay500ms();
		
		P2 = 0xDF;		//1101 1111 
		Delay500ms();
		
		P2 = 0xBF;		//1011 1111 
		Delay500ms();
		
		P2 = 0x7F;		//0111 1111 
		Delay500ms();
	}
}
